Spirit-level attachment.



W. C. OSWALD. SPIRIT LEVEL ATTACHMENT.

APYLIOATIDH FILED MAY 1. 1908.

Patented Oct. 5, 1909.

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mum"! t I 0610M Zambia W 60i Streams WILLIAM C. OSWALD, OF OLEAN, NEW YORK.

SPIRIT-LEVEL ATTACHMENT.

Specification of Letters Patent.

Application filed May 1, 1908.

Patented Oct. 5, 1909.

Serial No. 430,299.

T 0 all whom it may concern:

lie it known that I. VILLIAM OSWALI), a citizen of the United States, residing at Olean, in the county of Cattarau us and State of New York, have inventet a new and useful Spirit-Level Attachment, of which the following is a specification.

The invention relates to improvements in spirit level attachments.

The object of the present invention is to improve the construction of spirit level attachments, and to provide a simple, inexpensive and etiicient device of this character capable of ready adjustment to arrange the bubble tubes in proper position with relation to the instrument, and adapted to permit a bubble tube to be readily removed and replaced b: a new tube. should the bubble tube be broken or otherwise impaired through rough handling of the instrument.

A further object of the invention is to provide a spirit level attachment having; a plurality of bubble tubes. adapted to increase the cliiciencv of the instrument to which the atta hment is applied and capable of atford ing a test of the accuracy of the use of the instrument.

\Vitlt these and other objects in view, the invention consists in the construction and novel combination of parts hereinafter fully described, illustrated in the. accompanying drawing, and pointed out in the claims hereto appended; it being understood that various changes in the form, proportion, size and minor details of construction, within the scope of the claims, may be resorted to Without departing from the spirit or sacritit-inn any of the advantages of the invention.

in the drawing :-Figure 1 is an elevation of a combined level and plumb provided with level attachments, constructed in ac.- cordance with this invention. Fig. 2 is an enlarged sectional view, illustrating, the construction of the level attachment. Fig. 3 is a sectional view on the line 33 of Fig. 2. Fig. 4 is a similar View on the line 4* of Fig. 2.

Like numerals of reference designate corresponding parts in all the figures of the drawing.

The spirit level attachment includes a pair ofparallcl bubble tubes 1, mounted in holders 2 consisting of tubular members or sleeves and arranged Within a rotary supporting ring- I The tubular holders have beveled or roundcd ends to conform to thc contiglu'ution of the supporting ring, and are prov ided with terminal lugs 4. curved to lit the ring and having slots 5 for thc reception of screws tu or other suit able fastening devices for adjustably securing the holders within the sup orting ring. By this construction the ho] ers may be readily adjusted to ar range the bubble tubes in proper position with relation to the supporting ring. The

holders are also provided at their inner opposite portions with central openings 7 for ex )osing the central portions of thc bubble tubes.

The supporting ring is provided at its side edges with circumferential recesses 8. forming outer bearing portions, which fit in circular openings of side plates 9 and it). The sections of the instrument are provided with circular openings for the rcccpticn of the level attachment. and the side plates 9 and 10 are fitted'in side recesses and have their outer faces in flush relation with the side faces of the sections, as clearly iiius trated in Figs. 3 and 4 of the drawing. The side plates are connected by screws 11. piercing the side plates 10 and having reduced threaded terminals 12. which engage threaded perforations of the side plates 9. The reduction of the threaded ends of the screws 11 form shoulders, which engage the inner faces of the plates 9. h

The rotary ring is equipped with an arcuatc rack 13, consisting of a. segment of a gear and meshing with a pinion l-t. mounted on a shaft or spindle 15. The shaft or spindle 15, which is journalcd in a suitable bearing of a plate 16, has its inner end reduced and secured in a central opening of the pinion 14. The outer end of the sha ft or spindle 15 is provided with a head 17, having a. groove 18, which is adapted to be engra ed by the blade of a trowel. or other tool or rotatin the shaft. or spindle to adust the supportin ring, or member 1. \Vhen the shaft or spin le 15 is rotated, it carries with it the pinion 14, which in turning im parts a rotary movement to the ring or member 3 through the arcuate rack 13. The arcuate rack, which is rigid with the supporting rin or member 3, may be applied to the sameTy any suitable means.

The side plates 9 and 10 are provided with suitable graduations 19, and the supporting ring or member has indicator marks. which arc movahlc over the graduated portions of the side plates, whereby the spirit lcxcl at taehment may l accurately set as a plumb or level. or for indicating an angle or int'llllilllllll.

The duplication of the spirit level or hublllt tulies and the arrangement of the same in parallelism will enable either edge or enth ot' a i-nmhined level and plumli to he titted against the work. and the atl'ord a test of the accurac of the instrument, as the work must he true and accurate when both of the linlihle or spirit level tubes show the work to he true. If either of the spirit tubes should be out of true with the other or With the straight edges of the level. both will not indicate the same result on the same piece oi work.

Having thus fully described my invention, what I claim as new and desire to secure by Letters Patent. is:--

l. A spirit level attachment ineludin a supporting ring, opposite spirit ttlllt holr ers located within the ring and having curved faces tilting against the aame, said holders lieing capable of arcuate adjustment. and

means for securing the spirit tube holders 1 in their adjustment. I

2. A spirit level attachment including a rotary supporting ring, a. spirit tube holder supporting ring. a linhhle tulie. and a holder arranged within the ring and carrying the bubble tube and having terminal means titted agaimt the rin; and adjustably secured to the same at each end of the holder.

; adjustahly securing the holder to the supporting ring.

6. A spirit level attachment including a rotary supporting rim". means for adjusting the same. spirit tulaholders arranged \Ylllllll the ring at opposite sides of the cen ter thereof, coml ylete Hpll'lt tithes carried hv the holders. and means tor securing the holders to the tine and for providing an arcuate adjustment of the spirit tubes independent of the rotary adjustment of the ring.

In testimony. that I claim the foregoing as my own, I have hereto affixed my sigma ture H]. the presence of two Witnesses.

WILLIAM (l. ()SVVALD.

IV i tnesses:

(lamina B. CARTER, S. A. RiirNoLns. 

